package org.activiti.rest.editor.model;

import org.activiti.editor.constants.ModelDataJsonConstants;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.RepositoryService;
import org.activiti.engine.repository.Model;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

@RestController
public class ModelEditorJsonRestResource implements ModelDataJsonConstants
{
    protected static final Logger LOGGER = LoggerFactory
            .getLogger(ModelEditorJsonRestResource.class);

    @Autowired
    private RepositoryService repositoryService;
    @Autowired
    private ObjectMapper objectMapper;

    @RequestMapping(value = "/model/{modelId}/json", method = RequestMethod.GET, produces = "application/json")
    public ObjectNode getEditorJson(@PathVariable
    String modelId)
    {
        ObjectNode modelNode = null;
        Model model = repositoryService.getModel(modelId);
        if (model != null)
        {
            try
            {
                if (StringUtils.isNoneEmpty(model.getMetaInfo()))
                {
                    modelNode = (ObjectNode) objectMapper.readTree(model
                            .getMetaInfo());
                }
                else
                {
                    modelNode = objectMapper.createObjectNode();
                    modelNode.put(MODEL_NAME, model.getName());
                }
                modelNode.put(MODEL_ID, model.getId());
                ObjectNode editorJsonNode = (ObjectNode) objectMapper
                        .readTree(new String(repositoryService
                                .getModelEditorSource(model.getId()), "utf-8"));
                modelNode.putPOJO("model", editorJsonNode);
            }
            catch (Exception e)
            {
                LOGGER.error("Error creating model JSON", e);
                throw new ActivitiException("Error creating model JSON", e);
            }
        }
        return modelNode;
    }

}
